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The purpose of this research is to design a rounding cylinder tube on a coffee roaster using an electric heating element that will be used to roast coffee. The roasting process also uses an electric motor to rotate the cylindrical drum so that the stirring process becomes even. The research was conducted using engineering methods including identification of problems, roasting machine design formulation, prototyping, functional testing, and performance testing. The data analysed are roasting capacity, roasting temperature and the need for electrical energy used. The results showed that the roasting capacity was 2.3 kg.h-1. The serving of coffee for dark roast maturity levels can be ended when the temperature has reached a temperature of 201 °C. The need for electrical energy in the heater for roasting arabica coffee beans with a maturity level of a dark roast for 1 hour 54 minutes obtained an average value of 3.4 kWh, with the need for electrical energy for roasting arabica coffee beans which is 1.35 kWh.

Patchouli plant characteristics are the basis that must be ascertain to design a patchouli harvester machine. The objective of this study was to determine the physical and mechanical characteristics of patchouli plants that can be used in the design of patchouli harvester machines. The data were collected by doing observation and measurement in the field and laboratory. Patchouli plants used with water content from 30 to 40% at the age of harvest 8 months after planting. Various physical characteristics of patchouli indicated the average value of plant height 112.7 cm, clump circumference 1.67 m, main stem diameter 9.88 mm, the clump diameter at a height of 20 cm from the surface of the land 16.5 cm, mass/clump 1.48 kg, and bulk density 0.11 kg/L. Physical characteristics play an important role in choosing equipment and the main dimension in designing a harvester machine. Determination of mechanical characteristics showed that the tensile strength value of patchouli was from 5.7 to 17.15 MPa with a modulus of elasticity from 0.12 to 0.5 GPa. The forces required for the design of the harvester machine such as the laying force, the retraction force and patchouli's cutting resistance achieved an average value of 6.19 N, 68.89 N, 108.47 N, respectively. The mean angle of repose was 48° at 32 % moisture content and friction coefficient was 0.71. The results obtained about the physical and mechanical characteristics of patchouli plants can be useful in providing information that helps in designing patchouli harvesting machines.

Indonesia started to apply and develop agricultural mechanization to increase agricultural productivity. However, the development of agricultural mechanization is not always get success, we still can found fatigue in operation of tool of agricultural mechanization , which if this still happen would able to make a decline of productivity. This research aims to find out of workload that produced by operator in stubble shaving process by using hand tractor with two different hand tractor engine rotation speeds, it is 1600 RPM and 1800 RPM. This research is located in sugarcane plantation at Kebun Tanjung Jatti, Binjai, Sumatera Utara. Key words: Ergonomic, Stubble Shaving, Sugarcane,Workload

Abstrak. Penelitian ini bertujuan merancang sebuah penjatah pupuk butiran (metering device) tipe edge cell yang dapat mengontrol keluaran pupuk dengan cara mengatur kecepatan putar motor yang dirakit dengan rangkaian elektronika dan menguji kinerja prototipe metering device dengan menggunakan 3 jenis pupuk yaitu Urea, TSP dan KCl. Hasil Penelitian alat yang dirancang hanya mampu mengalirkan pupuk urea dan TSP, sedangkan pupuk KCL mengalami kesulitan keluar dari celah hopper. Jumlah rata-rata keluaran pupuk Urea untuk penjatah 1 pada tegangan 12,16 dan 20 volt berturut-turut sebesar 81,33 gr/menit, 130,33 gr/menit dan 169,00 gr/menit. Pada penjatah 2 keluaran pupuk masing-masing nilai tegangan yang dberikan berturut-turut sebesar 75,67 gr/menit, 129,00 gr/menit dan 168,20 gr/menit. Jumlah rata-rata keluaran pupuk TSP untuk penjatah 1 pada tegangan 12, 16 dan 20 volt berturut-turut sebesar 121,20 gr/menit, 181,53 gr/menit dan 244,67 gr/menit. Pada penjatah 2 keluaran pupuk masing-masing nilai tegangan yang dberikan berturut-turut sebesar 119,27 gr/menit, 180,53 gr/menit dan 243,73 gr/menit. Rancang Bangun Dan Pengujian Alat Penjatah (Metering Device ) Tipe Edge Cell Untuk Penyaluran Pupuk Butiran Urea, TSP dan KCl Abstract. This study aims to design a fertilizer granules allotment (metering device) type of cell edge that can control the fertilizer output by regulating the rotational speed of the motor is assembled with electronic circuits and test the prototypes performance using a metering device with 3 types of fertilizers ie Urea, TSP and KCl. Research tools are designed only able to drain urea and TSP , while KCL fertilizer have trouble escaping from the gap hopper . The average amount of urea metering device 1 output to the voltage 12.16 and 20 volts, respectively for 81.33 g /min, 130.33 g/min and 169.00 g/min. In metering device 2 each fertilizer output voltage feed all values in a row at 75,67 g/min, 129.00 g/min and 168.20 g/min. The average number of TSP output to metering device 1 at the 12.16 and 20 volts, respectively for 121.20 g/min, 181.53 g/min and 244.67 g/min. In metering device 2 each fertilizer output voltage feed all values in a row of 119.27 g/min, 180.53 g/min and 243.73 g/min.

Weeds were plants whose presence was undesirable because it lowered the yield of agricultural land that could be achieved by the production plant. Weeding the groundnut crop had been done conventionally, weeding method had many drawbacks. The purpose of this research was to design, fabricate and per-formance test of the weed clean device on peanut plants. The results showed that the dimensions of the weed clean device was 1332 mm long, connecting rods were made of pipe with a diameter of I inch, wide handlebars 732 mm diameter, wheel steering handlebars handheld was 48 mm, wheelbase was 150 mm steel, blade was made of steel plate 2 mm with a length of 250 mm and a width of 20 mm. The strength and durability of the weed clean device were met because the stress permis (131 MPa) was greater than the stress occurred (16.9 Mpa). From the obtained performance test of weed clean device capacity was 16 hours /ha, better than weeding manually, 90 hours /ha.